Fix: bad explanation

scripts/contracts/email_expire_services_to_customers.php

@@ -42,7 +42,7 @@ if (! isset($argv[1]) || ! $argv[1] || ! in_array($argv[1],array('test','confirm
 	print "\n";
 	print "Send an email to customers to remind all all contracts services to expire.\n";
 	print "If you choose 'test' mode, no emails are sent.\n";
-	print "If you add a delay (nb of days), only invoice with due date < today + delay are included.\n";
+	print "If you add a delay (nb of days), only services with expired date < today + delay are included.\n";
 	exit;
 }
 $mode=$argv[1];